They absolutely cannot handle heavy use. I bought the pcc kit from TW, not realizing that it wouldn't come with a basic charger... only the pcc. After about a month of use, the pcc lid didn't have enough pressure on the battery to charge it, I ended up having to put a piece of paper in the lid to get it to press down enough to charge. Eventually, the paper didn't even work... So now I have to use a rubber band to hold it down to charge. If you're ONLY using the pcc to charge on the go, and using a traditional charger at home, you shouldn't have any problems. But anything in the way of heavy use, and it will not hold up. I'd like to get my hands on the 'tard who designed this thing... Who makes a charger that requires the lid to apply the pressure in order to charge, vs. screwing it in?
Great idea, terribly executed.
I've tested this... if the light doesn't come on, it is not charging.